Ensuring high availability is crucial for database systems, and PostgreSQL offers robust replication features to achieve that. Setting up replication in PostgreSQL ensures that your data is consistently available, even in the case of server failures. This guide will walk you through the process of establishing replication in PostgreSQL to step up your database reliability and performance.
Before you set up replication, you need to configure your primary server appropriately:
postgresql.conf file to include:
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# Enable replication wal_level = replica # Specify the maximum number of concurrent connections from standby servers max_wal_senders = 3 # Retain WAL segments for standby/server reinitialization wal_keep_segments = 64 |
pg_hba.conf file for replication access:
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# Example entry for a standby server connection host replication all [IP_of_standby_server] md5 |
pg_basebackup to clone the primary server:
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pg_basebackup -h [primary_server_ip] -D /var/lib/postgresql/12/main -U [replication_user] -vP --wal-method=stream |
recovery.conf file on the standby server:
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# Point to primary server standby_mode = 'on' primary_conninfo = 'host=[primary_server_ip] port=5432 user=[replication_user] password=[replication_password]' trigger_file = '/tmp/pgsql.trigger.5432' |
After setting up the necessary configurations, you can start the standby server. Ensure both the primary and standby server are in sync for seamless failover capability.
By replicating data on multiple servers, you gain the following advantages:
Explore more about managing PostgreSQL efficiently by exploring these topics:
By following this guide and exploring additional resources, you can optimize your PostgreSQL environment for high availability and efficient performance.